:root {
    --primary-blue: #1a5276;
    --secondary-blue: #2980b9;
    --light-blue: #5dade2;
    --accent-green: #27ae60;
    --light-green: #82e0aa;
    --dark-text: #2c3e50;
    --light-text: #7f8c8d;
    --background: #f8f9fa;
    --white: #ffffff;
    --status-green: #27ae60;
    --status-yellow: #f39c12;
    --status-red: #e74c3c;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--dark-text);
    line-height: 1.6;
    background-color: var(--background);
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 2rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

nav .container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.logo span {
    color: var(--accent-green);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark-text);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--secondary-blue);
}

.nav-links a.active {
    color: var(--secondary-blue);
    border-bottom: 2px solid var(--secondary-blue);
    padding-bottom: 2px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 50%, var(--accent-green) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    padding: 6rem 2rem 4rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="waves" patternUnits="userSpaceOnUse" width="100" height="20"><path d="M0 10 Q 25 0, 50 10 T 100 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="2"/></pattern></defs><rect width="100" height="100" fill="url(%23waves)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    max-width: 900px;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--white);
    color: var(--primary-blue);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

/* Section Styles */
section {
    padding: 5rem 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.5rem;
    color: var(--primary-blue);
    margin-bottom: 1rem;
    text-align: center;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--light-text);
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3rem;
}

/* Methodology Section */
.methodology {
    background: var(--white);
}

.methodology-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.methodology-text h3 {
    font-size: 1.8rem;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
}

.methodology-text p {
    margin-bottom: 1.5rem;
    color: var(--dark-text);
}

.tool-list {
    list-style: none;
    padding: 0;
}

.tool-list li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    border-bottom: 1px solid #eee;
}

.tool-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-green);
    font-weight: bold;
}

.tool-list li strong {
    color: var(--primary-blue);
}

.methodology-image {
    background: linear-gradient(135deg, var(--light-blue), var(--light-green));
    border-radius: 20px;
    padding: 3rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.methodology-image .icon {
    font-size: 5rem;
    margin-bottom: 1rem;
}

/* Map Section */
.map-section {
    background: var(--background);
}

#map {
    height: 600px;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    margin-top: 2rem;
}

.map-legend {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 10px;
    margin-top: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.legend-title {
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 1rem;
    text-align: center;
    font-size: 1.1rem;
}

.legend-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.2s;
    user-select: none;
}

.legend-item:hover {
    background: var(--background);
}

.legend-item.disabled {
    opacity: 0.4;
}

.legend-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--secondary-blue);
}

.legend-color {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.legend-color.sampling-excellent {
    background: var(--status-green);
}

.legend-color.sampling-critical {
    background: var(--status-red);
}

.legend-color.sampling-moderate {
    background: var(--status-yellow);
}

.legend-color.infrastructure {
    background: #2980b9;
}

.legend-color.boundaries {
    background: transparent;
    border: 3px solid var(--accent-green);
}

.legend-label {
    font-size: 0.9rem;
    color: var(--dark-text);
}

/* Results Section */
.results {
    background: var(--white);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.result-card {
    background: var(--background);
    border-radius: 15px;
    padding: 2rem;
    border-left: 5px solid;
    transition: transform 0.3s, box-shadow 0.3s;
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.result-card.excellent {
    border-left-color: var(--status-green);
}

.result-card.critical {
    border-left-color: var(--status-red);
}

.result-card.moderate {
    border-left-color: var(--status-yellow);
}

.result-card h4 {
    font-size: 1.4rem;
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.status-badge {
    display: inline-block;
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.status-badge.excellent {
    background: rgba(39, 174, 96, 0.15);
    color: var(--status-green);
}

.status-badge.critical {
    background: rgba(231, 76, 60, 0.15);
    color: var(--status-red);
}

.status-badge.moderate {
    background: rgba(243, 156, 18, 0.15);
    color: var(--status-yellow);
}

.result-card ul {
    list-style: none;
    padding: 0;
}

.result-card li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #e0e0e0;
}

.result-card li:last-child {
    border-bottom: none;
}

/* Monitoring Data Section */
.monitoring-data {
    background: var(--white);
}

.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.chart-card {
    background: var(--background);
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.chart-card h4 {
    color: var(--primary-blue);
    margin-bottom: 1rem;
    text-align: center;
}

.chart-wrapper {
    position: relative;
    height: 300px;
}

.data-table-container {
    margin-top: 3rem;
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--background);
    border-radius: 10px;
    overflow: hidden;
    font-size: 0.9rem;
}

.data-table th {
    background: var(--primary-blue);
    color: white;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

.data-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #e0e0e0;
}

.data-table tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.02);
}

.data-table tr:hover {
    background: rgba(41, 128, 185, 0.08);
}

.value-good {
    color: var(--status-green);
    font-weight: 600;
}

.value-bad {
    color: var(--status-red);
    font-weight: 600;
}

.value-moderate {
    color: var(--status-yellow);
    font-weight: 600;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    border: 2px solid var(--secondary-blue);
    background: transparent;
    color: var(--secondary-blue);
    border-radius: 25px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
}

.filter-btn:hover, .filter-btn.active {
    background: var(--secondary-blue);
    color: white;
}

@media (max-width: 768px) {
    .charts-container {
        grid-template-columns: 1fr;
    }

    .chart-wrapper {
        height: 250px;
    }
}

/* Data Section */
.data-section {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    color: var(--white);
}

.data-section .section-title {
    color: var(--white);
}

.data-section .section-subtitle {
    color: rgba(255, 255, 255, 0.85);
}

.data-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.data-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 2rem;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.data-card .icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.data-card h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.data-card p {
    opacity: 0.85;
    font-size: 0.95rem;
}

.cta-button.secondary {
    background: transparent;
    border: 2px solid var(--white);
    color: var(--white);
    margin-top: 3rem;
}

.cta-button.secondary:hover {
    background: var(--white);
    color: var(--primary-blue);
}

/* Next Steps Section */
.next-steps {
    background: var(--background);
}

.next-steps-content {
    background: var(--white);
    border-radius: 15px;
    padding: 3rem;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.next-steps-content h3 {
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

/* Footer */
footer {
    background: var(--dark-text);
    color: var(--white);
    padding: 3rem 2rem;
    text-align: center;
}

footer .credits {
    margin-bottom: 1.5rem;
}

footer .credits strong {
    color: var(--light-blue);
}

footer .eu-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

footer .copyright {
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .methodology-content {
        grid-template-columns: 1fr;
    }

    .nav-links {
        display: none;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }

    #map {
        height: 400px;
    }
}

/* Custom Leaflet Popup */
.leaflet-popup-content-wrapper {
    border-radius: 10px;
}

.popup-content h4 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.popup-content p {
    margin: 0.25rem 0;
    font-size: 0.9rem;
}